Electrolysis: processes – compositions used therein – and methods – Electrolytic analysis or testing – For properties of solid material
Patent
1993-11-23
1996-04-09
Tung, T.
Electrolysis: processes, compositions used therein, and methods
Electrolytic analysis or testing
For properties of solid material
204400, 204404, 204412, 204434, 2057755, G01N 2726
Patent
active
055058272
ABSTRACT:
An electrolyte such as a saturated picric acid solution in a cell for measuring electrochemical polarization is placed in contact with an alloy steel such as a CrMoV steel which has been subjected to a high-temperature and stress-applied condition, and a potential is swept between the CrMoV steel and a salt bridge in the cell, whereby the Mo-rich carbide M.sub.6 C undergoes a dissolution reaction at a potential near a specified value and this reaction is visible as the secondary anode peak current, or the second appearance of peak current on the waveform of electric polarization. Since the secondary anode peak current is closely related to the amount of M.sub.6 C precipitation, the progress of degradation in the CrMoV steel can be evaluated by a simple method with good precision.
REFERENCES:
patent: 3479256 (1969-11-01), Smith et al.
patent: 3925168 (1975-12-01), Costas
patent: 3943043 (1976-03-01), Billington
patent: 4160702 (1979-07-01), Baxter
"Evaluation of the Degraded CrMoV Steel by Electrical Polarization Method", Mitsuo Yamashita et al., Proceedings of the 1992 Annual Meeting of JSME/MMD, No. 920-72, pp. 437-438, Sep. 2-3, 1992.
Kato Nobuo
Sakuma Naokatsu
Watanabe Terutsugu
Yamashita Mitsuo
Fuji Electric & Co., Ltd.
Tohoku Electric Power Co. Inc.
Tung T.
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